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Evaluation of Ecological Site Classes and Community Classes for Regional Scale Modeling of Conservation Effects on Grazing Lands: Mlra 74

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Evaluation of Ecological Site Classes and Community Classes for Regional Scale Modeling of Conservation Effects on Grazing Lands: Mlra 74 EVALUATION OF ECOLOGICAL SITE CLASSES AND COMMUNITY CLASSES FOR REGIONAL SCALE MODELING OF CONSERVATION EFFECTS ON GRAZING LANDS: MLRA 74 Steve Barker, Resource Management System L.L.C. Pat Shaver, Rangeland Management Services L.L.C. Edits/Oversight by Loretta J. Metz, USDA-NRCS, Resource Assessment Division, CEAP- Grazing Lands. INTRODUCTION The Grazing Lands Component of the Conservation Effects Assessment Project is evaluating the development and use of general Ecological Site Classes and Community Classes within Major Land Resource Areas for regional and national scale modeling of conservation effects. National Resources Inventory (NRI) data was correlated to the identified to provide data for the Agricultural Policy/Environmental eXtender (APEX) model and other models. The Rangeland Hydrology and Erosion Model (RHEM) was used to do assessments of runoff and erosion for this evaluation. DEFINITIONS ECOLOGICAL SITE CLASS Ecological Site Classes are proposed subdivisions of a Major Land Resource Area (MLRA) or Land Resource Unit (LRU). They are similar in concept to a general soil survey map unit – a general grouping of ecological sites by major landforms and vegetation types. An Ecological Site Class generally differs from other kinds of land in the kinds and amounts of vegetation produced, and in the responses to disturbances, recovery mechanisms, and management. Three Ecological Site Classes were initially identified, working with the expert soil and range scientists in MLRA 74: • Loamy Upland Site Class • Sandy Upland Site Class • Terrace Site Class Each Ecological Site within the MLRA was correlated to an Ecological Site Class. PLANT FUNCTIONAL GROUPS The Plant Functional/Structural Group indicator is defined in Interpreting Indicators of Rangeland Health (version 4) as, “A suite or group of species that because of similar shoot or root structure, photosynthetic pathways, nitrogen fixing ability, life cycle, etc., are grouped together on an ecological site basis.” 1 | Page The presence, dominance and relative proportions of plant functional groups affect soil, hydrologic and biotic variables including: • the kinds and amounts of canopy and foliar cover • litter cover • plant spacing • amount and arrangement of bare ground • structure and continuity of vegetation which then influences the potential to carry fire and regulate fire intensity • grazing preferences • wildlife habitat values • runoff and erosion rates The change in presence, dominance and/or proportion of plant functional groups is the primary attribute used to characterize States and Community Phases within an Ecological Site Description. Standardized Plant Functional Groups based on growth form and primary flowering season (as opposed to photosynthetic pathway) were developed for this project as a method to standardize how plant communities are evaluated and correlated to a specific Community Class. Cool season (C3) and warm season (C4) photosynthetic pathways are not known and/or the information is readily available for many species. Most plant references provide a flowering period for each species. The dominant flowering period (spring or summer) was used to characterize when the plants are in a reproductive phase. This is often when treatment is applied in order to encourage or suppress seed production. All plant species found in the MLRA were assigned to one of the plant functional groups, and production by functional group was calculated for each NRI Primary Sampling Unit (PSU) community. COMMUNITY CLASS Community Classes are proposed as generalized plant communities within an Ecological Site Class. A Community Class is differentiated from other Community Classes by the presence and relative proportions by annual production of plant functional groups. The Community Class name is created using the most dominant 7 functional groups, in descending order. Initial Community Classes were identified using the Community Phases within the Ecological Site Descriptions, with input from the local experts in the MLRA. Each NRI PSU in the MLRA was correlated to a Community Class where possible. Some PSU data points were not used when the data (species present and/or production) was questionable. Additional Community Classes that are not currently represented in the Ecological Site Descriptions were added based on NRI data (mostly non-native dominated communities). Community Class names are derived using the top seven plant functional groups, listed in descending order of annual production. The production for 2 | Page the plant functional groups is calculated from the NRI PSUs that are correlated to the Community Class. PLANT COMMUNITY The actual plant community at any given location, at a point in time. FIGURE 1: KANSAS TALLGRASS PRAIRIE 3 | Page ECOLOGICAL SITE CLASSES AND COMMUNITY CLASSES FOR MAJOR LAND RESOURCE AREA 74 – CENTRAL KANSAS SANDSTONE HILLS MLRA 74 occurs in the western half of the Flint Hills of Kansas. This area is part of the Central Great Plains Winter Wheat and Range Region (LRR H). The area is generally characterized by broad undulating plains dissected by wide floodplains and terraces. Elevations range from 1310 feet to 1640 feet above mean sea level. Cretaceous sandstone bedrock, shale, and Permian limestone underlay this region. The central portion of the MLRA was once a major drainage way for glaciers that extended near the northern end of this MLRA. Many of the soils contain buried fluvial deposits from this period. Plant communities are dominated by tall- and mid- grasses, including big bluestem, switchgrass, sideoats grama and western wheatgrass. Fire plays a major role in maintaining these tallgrass plant communities. The following climate information is from the Loamy Upland (PE 26-30) Ecological Site Description. “The area has a typical mid-continental climate with FIGURE 2: MLRA 74 MAP FROM LAND RESOURCE REGIONS AND wide fluctuations in both daily and annual temperature MAJOR LAND RESOURCE AREAS OF THE UNITED STATES, THE variations. Typically winters are relatively short, mostly CARIBBEAN, AND THE PACIFIC BASIN. U.S. DEPARTMENT OF December through February. They can, however, be AGRICULTURE HANDBOOK 296 extremely cold because of frequent polar “expresses” or “Alberta Clippers” that rush cold air down from the arctic. Warmer temperatures prevail for about half of the year providing for a long growing season. The climate data listed in the tables below represent high and low ranges and averages for the climate stations and dates listed. For additional climate data, access the National Water and Climate Center at http://www.wcc.nrcs.usda.gov .” Averaged Frost-free period (days): 152 Freeze-free period (days): 175 Mean annual precipitation (inches): 33 4 | Page Monthly Precipitation (Inches): Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High 1.18 1.51 3.93 3.74 6.58 5.65 7.11 5.74 3.80 3.65 2.63 1.45 Low 0.21 0.18 0.75 1.27 2.42 2.05 1.06 1.28 1.04 0.60 0.42 0.25 FIGURE 3 Monthly Temperature (°F): Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High 39.0 45.5 56.3 66.9 75.9 87.0 92.7 90.6 82.1 70.4 53.5 42.3 Low 17.2 21.9 31.5 41.5 52.5 62.0 67.4 65.5 56.2 44.0 30.8 21.2 FIGURE 4 Representative Climate Stations (1) KS1767, Concordia WSO Airport, KS. Period of record 1971-2000 (2) KS4178 Kanopolis Lake, KS Period of Record 1971-2000 (3) KS4712 Lincoln 2 ESE, KS Period of Record 1971-2000 (4) KS5363 Minneapolis, KS Period of Record 1971-2000 (5) KS7160 Salina FAA Airport, KS Period of Record 1971-2000 (6) KS8578 Washington, KS Period of Record 1971-2000 (7) KS8946 Wilson Lake, KS Period of Record 1971-2000 TYPICAL AGRICULTURAL OPERATIONS Most of the agricultural producers in MLRA 74 are farmers who also run some cattle. There are a few ranches. Most cattle are English breeds – Angus and Hereford. Red Angus have become more popular in recent years. There are some Limousin and Charolais breeds. Weaning weights average 500 lbs. for heifers and 550 lbs. for steers. Early calving is done around April 1. Late calving is done in late June through early July. NRCS grazing prescriptions use 25% harvest efficiency and about 50% utilization levels. Conservative stocking rates average 8 to 10 acres per AU, with many producers running as high as 5 acres per AU. The rangelands are primarily grazed during the spring growing season when the corn gets planted (late March through April). The calves are worked and the cows are put in the pastures with the bulls. Most producers do not rotate grazing during the summer. Many producers utilize an intense early grazing (90 day grazing) strategy on their rangelands. Those that use a rotation on the rangeland will generally have a 2nd pasture that the herd is moved to around June. Once the crops are harvested in October, the livestock are moved onto crop residue and/or are fed hay on dry lots during the dormant season. Drought strategies include early weaning (Feb-March) and de-stocking based on planned trigger dates. Having a plan that identifies which animals will go first is encouraged. Other options include using alternative crops, crop stubble etc. 5 | Page RESOURCE MANAGEMENT SYSTEMS PRESCRIBED GRAZING Livestock grazing is not a significant driver of plant community changes within MLRA 74. Excessive continuous livestock grazing can reduce the production of tallgrasses, pushing the communities to more of a mid-grass community phase. But reducing the grazing pressure quickly restores the tallgrasses. Prescribed Grazing is commonly applied in this MLRA to build up fuel loads for Prescribed Burning. Deferment from grazing is not typically done after a springtime prescribed fire – the livestock are often put in the pasture while it is still smoking. It is more common to defer grazing after summer fires, but that is not always done.
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